1

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: June 07, 2021, 10:48:19 PM »

I've already solved the problem, it was on the op-amp don't know how but one of the resistor 5R6 that are there to protect the pcb did not burn before but now it have.. I've ordered one from you and it is ok, I guess..

Thanks for the help

2

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: May 27, 2021, 11:34:55 AM »

Boost on minimum : you mean Attenuation on minimum, right? Because P3 sets the HF attenuation.
If so, then you have a short circuit between the center and left pins. Look for solder bridge on the pins or R24.

Maybe I misunderstood what you requested. 

So I measured on the P3 which is the Boost from the Low frequencies.. 

On this image https://www.soundskulptor.com/docs/eqp501-layout-01.pdf the pots are supposed to be placed when front facing the pcb? If so then I have all the pots wrong.

3

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: May 26, 2021, 12:14:33 PM »

I've made a new measurement today and it was 0.8 ohms 

The resistance for the others is like so:

Center and right:
Boost on minimum - 0.6 ohm 
Boost on middle - 512.6 ohm 
Boost on max - 971 ohm 

Center and left:
Boost on minimum - 0.2 ohm 
Boost on middle - 0.2 ohm 
Boost on max - 0.2 ohm 

4

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: May 25, 2021, 11:34:14 AM »

The resistance is floating from 1 to 0.9

5

CP5176 FET compressor / Re: Resistor R57 burned on setup guide ..

« on: May 24, 2021, 03:21:47 PM »

Try again after removing the DOA.
If back to normal then check the DOA.

The problem was on the DOA.

I've ordered one already made and tested from you and replaced the resistor, everything ok. Installed mine and it burned again, so the problem is on DOA.. 


Thanks for everything

6

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: May 21, 2021, 02:24:08 PM »

It looks like your P3 pot is not correct. It should be 1k.
Can you measure it, between the 2 side pins, in circuit, after disconnecting the front PCB from the main PCB and with Low frequency ATTEN pot on 10 ?

I didn't get where to measure, can you please add some pics?

My pots pcb is like this:
http://imgur.com/a/7ZhfpTP

7

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: May 17, 2021, 07:24:46 PM »

Hi,

Answers inline

- what resistance do you measure between TP1 and TP3 (?10k)?
Yes

- what resistance do you measure between TP1 and 0V (?11k)?
No, ?15.7K

- what resistance do you measure between TP3 and 0V (?1k)?
No, ?4.6K

8

Discussions about the products / Helpful material Kits/BOM to buy

« on: May 05, 2021, 03:36:02 PM »

Hi,

Before all thanks Jean-Pierre for the amazing work on the kits and on the support that you give to all of us.

I've decided to create this topic so everyone can add here some useful kits/BOM for resistors/capacitor/.. that may help us to replace some that we might damage while building or to have just some spare parts.

Link for sheet on drive -> https://docs.google.com/spreadsheets/d/1kzfal7TAyo4N0uFZJwU9aYZX3IsKj96ONiPn_mEwPsY/edit?usp=sharing

Thanks for all your inputs in advance,

Best regards,
Sérgio

9

CP5176 FET compressor / Resistor R57 burned on setup guide ..

« on: May 05, 2021, 12:12:02 AM »

I was setting up the CP5176 following everything from the guide and on step 6. after turning on the compressor I've heard a click and then the R57 just burned ..

I've checked and the R57 was the right one.

Can this be a bad Resistor or  it's something worse?

Best regards,
Sérgio

10

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: May 04, 2021, 12:58:43 PM »

The pots P1... P5 and the resistors R10, R24 and R25 that you mentioned are right and the ones from assembly guide.

Is there any possibility that this can be the Film Capacitors?

11

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: May 02, 2021, 09:28:19 PM »

After testing I've seen different values 

0V -> TP1 : 1,999
0V -> TP3 : 0,564
0V -> TP2 : 5,804

12

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: April 28, 2021, 06:16:24 PM »

After changing the two swapped pots, the problem persists..

It gains some db, in bypass ok K20 it's around -6.5db and when active it goes around 3db .. it's a lot.

13

EQP501 Passive Equalizer / Re: Signal gain increase when engaged

« on: April 28, 2021, 11:03:30 AM »

Thank you very much for the answer. 

After analysing the Resistors are good and in the right place. But I noticed that the "2K2 Lin" is switched with the "100K Log" :/ need to change those and I'll let you know if this solves the issue. 

14

EQP501 Passive Equalizer / Signal gain increase when engaged

« on: April 26, 2021, 05:09:27 PM »

Hi, 

I've built a EQP501 and I think that almost everything is working normal except for the gain level that increases a lot when the EQP501 is not on bypass mode. 

When on bypass mode it is the same volume/gain that I'm sending out. When it is engaged it gains some db, cant precise how much right now, but latter I'll let you know.


Is this the normal behaviour? What can I do to test/check for problems. 
I've already checked and reheat all the solders.

15

XT500 Lunchbox connector extender / How to solder the EDAC connector to PCB?

« on: April 24, 2021, 12:55:43 AM »

Hi,

I’m Sérgio and I’m currently building some equipment from soundskulptor which I think it’s an awesome way to build gear and also learn a thing or two on how they work.

Well I’m a complete new to electronics so, for me this extender is the one thing that I don’t understand how to solder the EDAC to the PCB. The EDAC has 2 x 15 pins and they don’t fill in the gaps of the PCB which are 3 x 15. How should I solder them?

Best regards,
Sérgio